crypto: qat - add check for invalid PFVF protocol version 0

PFVF protocol version 0 is not a valid version, but PF drivers
currently would report any such version from VFs as compatible.
This patch adds an extra check for the invalid PFVF protocol
version 0.
Signed-off-by: Wojciech Ziemba <wojciech.ziemba@intel.com>
Signed-off-by: Marco Chiappero <marco.chiappero@intel.com>
Reviewed-by: Marco Chiappero <marco.chiappero@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_common/adf_pfvf_pf_proto.c

@@ -242,7 +242,9 @@ static int adf_handle_vf2pf_msg(struct adf_accel_dev *accel_dev, u8 vf_nr,
 			"VersionRequest received from VF%d (vers %d) to PF (vers %d)\n",
 			vf_nr, vf_compat_ver, ADF_PFVF_COMPAT_THIS_VERSION);
 
-		if (vf_compat_ver <= ADF_PFVF_COMPAT_THIS_VERSION)
+		if (vf_compat_ver == 0)
+			compat = ADF_PF2VF_VF_INCOMPATIBLE;
+		else if (vf_compat_ver <= ADF_PFVF_COMPAT_THIS_VERSION)
 			compat = ADF_PF2VF_VF_COMPATIBLE;
 		else
 			compat = ADF_PF2VF_VF_COMPAT_UNKNOWN;